The X. ecu Symposium on Calcified Tissues came about in Hamburg from sixteenth to 21 st September 1973. The monetary backing got here from the Gesund­ heitsbehorde der Freien und Hansestadt Hamburg (President Dr. Zylmann), the Bundesministerium fur Jugend, Familie und Gesundheit, and from undefined. This made it attainable to hold out the medical software, to ask numerous eu and non-European scientists, and to prepare a social software designed to set up own touch among delegates and to make viewers familiar with our nation. within the identify of the organizing committee, we herewith convey our warmest appreciation of all of the support given to us. Professor Bartelheimer, because the consultant of the clinical school and on behalf of the President of the collage of Hamburg, welcomed the Parti­ cipants within the symposium to our urban. The historical past of those conferences begun in Oxford in 1963, with the 1st eu Bone and enamel Symposium, equipped through H. J. J. Blackwood, B. E. C. Nordin, and Dame Janet Vaughan. the assumption was once to present in Europe an establishment simi­ lar to the yank Gordon examine meetings of Bone and teeth. After the U. ok. , the host nations have been Belgium, Switzerland, the Netherlands, France, Sweden, Italy, Israel and Austria. the second one symposium in Liege already bore the current name.

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U] Si 0,+ Plasma Calcium - + Vo [Cas] + [CaJvo _ - + jparathyroid glands [u] = -E + + - PTH Bone +-E ~ PTH vr + Kidney +-E vIi + Vs Vu Fig. 3. Diagram of plasma calcium regulation including parathyroid hormone (PTH) action, but omitting other hormonal controls. For definition of other symbols, see fig. 2. (From BRONNER, 1973a. ) 20 Kidney responds to a negative error by decreasing Vu and to a positive error by increasing vu. , 1973). It is important to point out that whereas parathyroid hormone release occurs in proportion to a negative error signal only, the metabolic effects of the hormone on bone and kidey are such as to lead to more precise error control, whether the plasma calcium error is positive or negative.

1971). II. I o q. I LR.. _L Rk · j=1 IJ k=1 jt i kti I + d. _I: Rk · fa. 10 kti The first set of equations describes the mass variation (Qi) of the n compartments and the second set, the variation of the quantity of tracer (qi) in each of them. The mass flow of material entering the compartment i is noted Rij, the output mass flow, Rki, and the irreversible entry rates of unlabeled and labeled material, dio and eio, respectively. , 1968) . +The authors are grateful to Dr. G. COUTRIS for his valuable suggestions during the preparation of this manuscript.